:root {
  --primary: #2c3e50;
  --primary-dark: #1a252f;
  --accent: #f1c40f;
  --accent-hover: #f39c12;
  --bg: #f5f7fa;
  --bg-alt: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.4);
  --text: #2c3e50;
  --text-secondary: #5a6b7c;
  --text-light: #8a9aa8;
  --border: #e1e8ed;
  --shadow-sm: 0 2px 8px rgba(44, 62, 80, 0.06);
  --shadow-md: 0 8px 24px rgba(44, 62, 80, 0.1);
  --shadow-lg: 0 16px 48px rgba(44, 62, 80, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --gradient-accent: linear-gradient(135deg, #f1c40f 0%, #f39c12 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
  --primary: #e8edf2;
  --primary-dark: #f5f7fa;
  --accent: #f1c40f;
  --accent-hover: #ffd700;
  --bg: #0f1419;
  --bg-alt: #1a2028;
  --bg-glass: rgba(26, 32, 40, 0.78);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text: #e8edf2;
  --text-secondary: #a0aec0;
  --text-light: #6b7a8a;
  --border: #2d3748;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --gradient-card: linear-gradient(145deg, #1a2028 0%, #1e2630 100%);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input {
  font-family: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-logo svg {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  transition: transform var(--transition);
}

.brand-logo:hover svg {
  transform: rotate(-6deg) scale(1.08);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.main-nav ul {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}

.main-nav a:hover {
  color: var(--text);
  background: rgba(241, 196, 15, 0.12);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.search-form {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 50px;
  overflow: hidden;
  transition: all var(--transition);
}

.search-form:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(241, 196, 15, 0.2);
}

.search-form input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--text);
  width: 180px;
  transition: width var(--transition);
}

.search-form input::placeholder {
  color: var(--text-light);
}

.search-form input:focus {
  width: 220px;
}

.search-form button {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}

.search-form button:hover {
  color: var(--accent-hover);
  background: rgba(241, 196, 15, 0.1);
}

.theme-toggle,
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.theme-toggle:hover,
.mobile-menu-btn:hover {
  color: var(--accent-hover);
  background: rgba(241, 196, 15, 0.12);
  transform: rotate(15deg);
}

.mobile-menu-btn {
  display: none;
}

.mobile-menu {
  display: none;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 12px 24px 20px;
}

.mobile-menu:not([hidden]) {
  display: block;
  animation: slideDown 0.3s ease;
}

.mobile-menu ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.mobile-menu a {
  display: block;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.mobile-menu a:hover {
  color: var(--text);
  background: rgba(241, 196, 15, 0.12);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px 0;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
}

.breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 8px;
  color: var(--text-light);
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent-hover);
}

/* ===== HERO BANNER ===== */
.hero-banner {
  position: relative;
  max-width: 1280px;
  margin: 20px auto 0;
  padding: 0 24px;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.banner-slider {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 3 / 1;
  min-height: 220px;
}

.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
  transform: scale(1.04);
}

.banner-slide.active {
  opacity: 1;
  transform: scale(1);
  z-index: 2;
}

.banner-svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-prev,
.banner-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  opacity: 0;
}

.hero-banner:hover .banner-prev,
.hero-banner:hover .banner-next {
  opacity: 1;
}

.banner-prev { left: 16px; }
.banner-next { right: 16px; }

.banner-prev:hover,
.banner-next:hover {
  background: rgba(241, 196, 15, 0.85);
  color: #1a1a2e;
  transform: translateY(-50%) scale(1.1);
}

.banner-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 8px;
}

.banner-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transition: all var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.banner-dots .dot.active {
  width: 28px;
  border-radius: 5px;
  background: var(--accent);
  border-color: var(--accent);
}

.banner-dots .dot:hover {
  background: rgba(255, 255, 255, 0.7);
}

/* ===== QUICK ANSWER ===== */
.quick-answer {
  max-width: 1280px;
  margin: 28px auto 0;
  padding: 0 24px;
}

.answer-lead {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.answer-lead:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.answer-lead strong {
  color: var(--primary);
  font-weight: 700;
}

[data-theme="dark"] .answer-lead strong {
  color: var(--accent);
}

/* ===== SECTIONS ===== */
.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 64px 24px;
}

.section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  position: relative;
  padding-bottom: 14px;
}

.section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 720px;
}

.section h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

/* ===== BRAND SECTION ===== */
.brand-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}

.brand-text h3 {
  margin-top: 24px;
  color: var(--primary);
}

[data-theme="dark"] .brand-text h3 {
  color: var(--accent);
}

.brand-text h3:first-child {
  margin-top: 0;
}

.brand-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 0.98rem;
  line-height: 1.85;
}

.brand-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  position: sticky;
  top: 92px;
}

.stat-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.stat-item:hover::before {
  transform: scaleX(1);
}

.stat-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(241, 196, 15, 0.4);
}

.stat-number {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  color: var(--accent-hover);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== PRODUCT GRID ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 2px;
  background: var(--gradient-accent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.product-card:hover::after {
  opacity: 1;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 18px;
  border-radius: 14px;
  transition: transform var(--transition);
}

.product-card:hover .product-icon {
  transform: scale(1.1) rotate(-4deg);
}

.product-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.product-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== ADVANTAGES ===== */
.advantages-section {
  background: var(--bg-alt);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-top: 20px;
  margin-bottom: 20px;
}

.advantage-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.advantage-item {
  padding: 26px 24px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
}

.advantage-item::before {
  content: "✓";
  position: absolute;
  top: 20px;
  right: 20px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #1a1a2e;
  font-weight: 900;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.5);
  transition: all var(--transition);
}

.advantage-item:hover::before {
  opacity: 1;
  transform: scale(1);
}

.advantage-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(241, 196, 15, 0.35);
}

.advantage-item h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  padding-right: 36px;
}

.advantage-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== SOLUTIONS ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.solution-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.solution-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.solution-card h3 {
  font-size: 1.08rem;
  margin-bottom: 10px;
}

.solution-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== INDUSTRY ===== */
.industry-section p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 900px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  box-shadow: var(--shadow-sm);
}

/* ===== CASES ===== */
.case-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}

.case-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
}

.case-item::before {
  content: "\201C";
  position: absolute;
  top: 10px;
  left: 20px;
  font-size: 4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.25;
  font-family: Georgia, serif;
}

.case-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(241, 196, 15, 0.35);
}

.case-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.case-item footer {
  font-size: 0.85rem;
  color: var(--text-light);
  font-style: normal;
  font-weight: 600;
}

/* ===== TESTIMONIALS ===== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.testimonial-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  text-align: center;
}

.testimonial-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.stars {
  color: var(--accent);
  font-size: 1.2rem;
  letter-spacing: 3px;
  margin-bottom: 14px;
}

.testimonial-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.testimonial-card .user {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 600;
}

/* ===== NEWS ===== */
.news-list {
  display: grid;
  gap: 18px;
}

.news-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.news-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.4s ease;
}

.news-item:hover::before {
  transform: scaleY(1);
}

.news-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

.news-item time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--accent-hover);
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.news-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.news-item h3 a {
  color: var(--text);
  transition: color var(--transition);
}

.news-item h3 a:hover {
  color: var(--accent-hover);
}

.news-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== ARTICLES ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}

.article-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle at top right, rgba(241, 196, 15, 0.15), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
}

.article-card:hover::after {
  opacity: 1;
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(241, 196, 15, 0.35);
}

.article-card h3 {
  font-size: 1.08rem;
  margin-bottom: 8px;
  line-height: 1.5;
}

.article-card h3 a {
  color: var(--text);
  transition: color var(--transition);
}

.article-card h3 a:hover {
  color: var(--accent-hover);
}

.article-card time {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  flex: 1;
  margin-bottom: 16px;
}

.read-more {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-hover);
  transition: all var(--transition);
  align-self: flex-start;
}

.read-more:hover {
  color: var(--accent);
  transform: translateX(4px);
}

/* ===== FAQ ===== */
.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.faq-item[open] {
  border-color: rgba(241, 196, 15, 0.45);
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color var(--transition), background var(--transition);
  position: relative;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(241, 196, 15, 0.15);
  color: var(--accent-hover);
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
  background: var(--gradient-accent);
  color: #1a1a2e;
  transform: rotate(180deg);
}

.faq-item summary:hover {
  color: var(--accent-hover);
  background: rgba(241, 196, 15, 0.06);
}

.faq-item p {
  padding: 0 24px 22px;
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.85;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== HOWTO ===== */
.howto-content {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 32px;
  box-shadow: var(--shadow-sm);
}

.howto-content h3 {
  font-size: 1.1rem;
  color: var(--primary);
  margin-top: 26px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

[data-theme="dark"] .howto-content h3 {
  color: var(--accent);
}

.howto-content h3:first-child {
  margin-top: 0;
}

.howto-content h3::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.howto-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 12px;
}

.howto-content ul,
.howto-content ol {
  padding-left: 0;
  margin-bottom: 16px;
}

.howto-content ul li,
.howto-content ol li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.howto-content ul li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}

.howto-content ol {
  counter-reset: step;
}

.howto-content ol li {
  counter-increment: step;
}

.howto-content ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #1a1a2e;
  font-size: 0.72rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== CONTACT ===== */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
  margin-bottom: 28px;
}

.contact-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(241, 196, 15, 0.35);
}

.contact-item h3 {
  font-size: 1.08rem;
  margin-bottom: 14px;
  color: var(--primary);
}

[data-theme="dark"] .contact-item h3 {
  color: var(--accent);
}

.contact-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

.service-promise {
  background: linear-gradient(135deg, rgba(241, 196, 15, 0.08), rgba(243, 156, 18, 0.12));
  border: 1px solid rgba(241, 196, 15, 0.3);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.service-promise h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--accent-hover);
}

.service-promise p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

/* ===== SITEMAP ===== */
.sitemap-section h2:not(:first-child) {
  margin-top: 40px;
}

.sitemap-links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

.sitemap-links a {
  display: block;
  padding: 12px 18px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-align: center;
}

.sitemap-links a:hover {
  color: var(--accent-hover);
  border-color: rgba(241, 196, 15, 0.45);
  background: rgba(241, 196, 15, 0.08);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.friend-links a {
  display: inline-block;
  padding: 10px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 50px;
  transition: all var(--transition);
}

.friend-links a:hover {
  color: var(--accent-hover);
  border-color: rgba(241, 196, 15, 0.45);
  background: rgba(241, 196, 15, 0.08);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--primary-dark);
  color: #cbd5e0;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

[data-theme="dark"] .site-footer {
  background: #0a0e13;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 56px 24px 36px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.footer-col h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: #a0aec0;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul a {
  font-size: 0.9rem;
  color: #a0aec0;
  transition: all var(--transition);
  display: inline-block;
}

.footer-col ul a:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 24px 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom p {
  font-size: 0.82rem;
  color: #718096;
  line-height: 1.9;
  margin-bottom: 6px;
}

.footer-bottom p:last-child {
  margin-bottom: 0;
  color: #5a6b7c;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #1a1a2e;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: all var(--transition);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 12px 32px rgba(241, 196, 15, 0.45);
}

.back-to-top:active {
  transform: translateY(-2px) scale(1.05);
}

/* ===== SCROLL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .main-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .brand-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .brand-stats {
    position: static;
    grid-template-columns: repeat(4, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    height: 60px;
    gap: 12px;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .search-form input {
    width: 120px;
    font-size: 0.8rem;
  }

  .search-form input:focus {
    width: 150px;
  }

  .section {
    padding: 44px 16px;
  }

  .hero-banner {
    padding: 0 16px;
    margin-top: 12px;
  }

  .banner-slider {
    aspect-ratio: 16 / 9;
    min-height: 180px;
  }

  .banner-prev,
  .banner-next {
    opacity: 1;
    width: 36px;
    height: 36px;
    font-size: 1.3rem;
  }

  .quick-answer {
    padding: 0 16px;
    margin-top: 20px;
  }

  .answer-lead {
    padding: 20px 20px;
    font-size: 0.95rem;
  }

  .brand-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat-item {
    padding: 20px 14px;
  }

  .product-grid,
  .solution-grid,
  .case-list,
  .testimonial-grid,
  .article-grid,
  .contact-info {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .advantage-list {
    grid-template-columns: 1fr;
  }

  .howto-content {
    padding: 24px 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 16px 28px;
  }

  .footer-bottom {
    padding: 20px 16px 28px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  .mobile-menu ul {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 10px 14px;
    gap: 8px;
  }

  .search-form {
    order: 3;
    width: 100%;
  }

  .search-form input {
    width: 100%;
    flex: 1;
  }

  .search-form input:focus {
    width: 100%;
  }

  .brand-name {
    font-size: 1rem;
  }

  .banner-slider {
    aspect-ratio: 4 / 3;
    min-height: 160px;
  }

  .section h2 {
    font-size: 1.3rem;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .faq-item summary {
    padding: 16px 18px;
    font-size: 0.92rem;
  }

  .faq-item p {
    padding: 0 18px 18px;
    font-size: 0.88rem;
  }

  .friend-links a {
    padding: 8px 16px;
    font-size: 0.82rem;
  }

  .sitemap-links ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ===== PRINT ===== */
@media print {
  .site-header,
  .back-to-top,
  .banner-prev,
  .banner-next,
  .banner-dots,
  .theme-toggle,
  .mobile-menu-btn {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .section {
    padding: 20px 0;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}